Modernização de instalação elétrica residencial por meio de retrofit : estudo de caso aplicado à segurança e eficiência energética

Abstract

This study addresses the retrofit of a residential electrical installation based on the requirements of ABNT NBR 5410:2004, aiming to adapt the electrical system to current standards of safety, reliability, and energy efficiency. The relevance of the topic is highlighted by data presented by ABRACOPEL (2025), which indicate high rates of electrical accidents in Brazil, often associated with outdated installations, lack of grounding systems, and inadequate protective devices. Based on the technical analysis of the existing installation, several non-conformities were identified, such as an obsolete distribution panel, faulty electrical connections, absence of conduits, and inadequate protection devices. From the diagnosis obtained, a complete retrofit of the installation was carried out following the recommendations of ABNT NBR 5410, including circuit reorganization, implementation of the TN-S grounding system, installation of residual current devices (RCDs), and replacement of obsolete electrical components. The results demonstrate the importance of electrical retrofit as an alternative for the modernization of old residential installations, contributing to the reduction of electrical risks, compliance with technical standards, and improvement of the operational performance of residential electrical systems.